Clamp for brake lining



Jline 5. 1928. 1,672,492

A. R. HUMPHIEY CLAMP FOR BRAKE LINING Filed July 7, 1927 Fatented June 5, 1928.

warren STATES ALQYSIUS R. HUMPHREY, F CLEVELAND,

OHIO, ASSIGNOR OF ONE-THIRD TO LOUIS a. ALBRECHT, 0F CLEVELAND, OHIO.

CLAMP non BRAKE LINING.

Application filed July 7,

This invention relates to improvements in devices for stretching and clamping brake lining while the lining is being applied to brake shoes.

The practice commonly followed in the application of lining to brake shoes of the internal, expanding type has been to rivet the lining to the shoe at one end and then to stretch the lining by hand and by the use 1 of a chisel and hammer or some other pointed instrument and hammer. Obviously, such methods are very crude and cannot be expected to produce a tight fitting lining.

Linings which are not tight have bulging portions between rivets that not only prevent even wear on the lining but also prevent the most efiicient use of the brakes for the reason that the valleys in the lining are not permitted to come into contact with the brake drum. Nevertheless,

these crude methods are generally adhered to because of the fact that such stretchers and clamps as have been proposed heretofore have been too cumbersome for certain types of brake shoes and have interfered with the use of riveting machines designed for the application of brake lining.

Accordingly, it. is one of the objects of my invention to provide a device of this character which will gri the lining near its free end and yet not interfere with the operation of the punching machine and rivetingi machine in setting rivets at such free en Another object is the provision of a 'de-. vice of the character referred to which will be of universal application and particularly one which may be employed upon' single piece shoes, the ends of which approach each other closely.

Other ob ects, and ob'ects relating to details of construction an economies of manufacture, will appear as I proceed with the description of those embodiments of the invention which, for the purposes of the present application, I have illustrated in the accompanying drawing, in which:

Fig. 1 is a" view in edge elevation of a brake shoe of the multiple piece type, with my stretcher and clamp applied thereto. j

Fig. 2 is a side elevation of the structure 7 shown in Fig. 1. I

Fig. 3 is a fragmental sectional view taken substantially on the line 3-3 Fig. 1.

- side posts 13 1927. Serial No. 203,918.

Fig. L is a view in side elevation of a shoe of the single piece type with my stretcher and clamp applied thereto.

Fig. 5 isan elevational view, partly in section, of a modified formof the device.

Fig. 6 is a sectional detail view taken on the line 6-6 Fig. 5.

Referring first to Figs. 1, 2 and .3, the brake shoe 10 here illustrated is one of a well known form in which three'shoes are used to make up the complete circle. The brake lining is shown at 11 and one of the device which forms the subject of the present invention is comprised of two parallel joined by a transverse end bar or cross-head 14 with teeth 15 for "initially set rivets'is; indicated at 12. The

gripping the lining and by a traveling v clamp bar- 16 for engagement with some part of the shoe, in this case the ends of a bifurcated portion of the latter marked 10' in the drawing. It is, of course, not es- 'sential that the cross-head 14 be formed of. a piece of metal separate from the side posts 13,- but for manufacturing reasons 7 it is mostdesirable to so construct it. As shown in Fig. 2, Iproduce a slight bend in each of the posts 13 near its upper end and reduce these ends to form shoulders against which the bar 14 bears. The reduced ends are threaded and nuts 17 are applied to hold the bar against these shoulders. The barl is thus supported with its teeth 15 inclined at the angle which has been found best suited to the average case.

The posts 13 are spaced apart far enough to straddle the thickest brake shoe upon -which the clamp is to be employed. These posts'are threaded for a considerable distance from their free ends and are then flatted upon opposite sides, as shown at 18.. The clamp bar 16 is preferably concaved somewhat on its upper ,face and prov vided with ribs or corrugations so that it may, the more readily en age and cling to the various kinds of surfaces encountered. At its ends, this bar is-provided with shoes 19 which may be either separate or integral with the bar-proper, these shoes having=fiatted I cylindrical openings, ther'ethrough, their flatted portions .20 engaging and sliding. upon the fiatted portions 18 of the posts. Hence wear upon the threads of the posts,

due to the movement of the bar 16 thereon, Q

is reduced to a minimum. The bar 16'may be moved toward the cross-head 14 by means of nuts 21 threaded upon the posts 13.

Fig. 4 illustrates the use of the same form of clamp in the application of lining to a single piece brake shoe, or one in which the parts of the shoe are not separable. In this figure, the shoe is designated 22.- At its ends it is provided with angles 23 secured thereto by rivets or the like. The lining is indicated at 24 and is shown secured to so. narrow that it easily fits between the ends of the shoe orthe angles 23 or similar arts.

or purposes of illustration, I have shown" the gripping bar 14 fixed and the clamping bar'16 movable, but obviously the opposite arrangement would come within the purview of my invention.

The form of the invention illustrated in Figs. 5 and 6 is similar in most particulars to that previously described, but differs in this respect that the nuts on the .posts 13 are moved simultaneously by a single operation. In Figs. 5 and 6, the nuts are shown at 26. Theyare provided with reduced ends 27 which fit in bearing h0les 28 and 29 that are formed in a transverse clamping bar 30 and in angular'extensions 31 thereof which are joined to the bar by end pieces 32.

These end pieces are wider than the parts" 30 and 31 and have bearings therein for the reduced end portions 33 of a shaft 34 WlllCh is provided with two sets of spiral teeth 35 meshing with spiral teeth 36 on the outside of nuts 26. One or both extremities of the shaft 34 are squared in order to receive a handle or tool by means of which the shaft ma be turned. The central p 'art of the bar 30 1s preferably bowed somewhat to'provide a'concave upper surface like that of the bar 16. Although the clamp bar 30 and its extensions 31 might have bearing upon the posts 13 similar to the bearing of the bar 16 in the previously described form ofthe invention, I prefer to mount these parts u on the reduced ends 27 of the nuts 26, he provision of flats on the posts is, therefore, unnecessary in this form of the device.

In the. use of either modification of the invention, brake lining cut to the proper length is placed upon the shoe and attached thereto at one end by means of rivets 12 or 25. The teeth 15 are then caused to grip .the lining near its opposite end' and the clamp is brought into position with its clamping bar 16 or 30, as the case may be,

opposite the bifurcated end 10' of the brake shoe 10 or opposite the angle 23 of the brake shoe 22. Now in the case of the first modification described, the operator turns up the nuts 21 by the use ofa spanner or other Wrench, being careful to manipulate one nut approximately equally with the other so that the bar 16 will be maintained in. substantially parallel relation with the cross-head 14. In the case of the second modification, the nuts 26 are turned simultaneously by the application of a crank handle or the like to one end of shaft 34. The. lining is thus stretched .upon the shoe and this stretching action is carried to an extent slightly greater than is required in the finished job. A pair of rivets are then set to hold the lining to the shoe at the end beyond where the clamp is apphed. Then the clamp is removed and the tension in the lining distributes itself evenly along the length of the piece. Thereafter, the remaining rivets are set and the job is finished.

The clam as illustrated in Fig. 4 contains a mo ifi cation of the structure illustrated in Figs. 1 and 2 in the respect that the bends in the posts 13 are in a reverse direction, which is of some advantage because it throws the posts further away from the surface of the lining near the cross-head, and thereby provides greater clearance for the use of punching and riveting machines. Having thus described my invention, I claim: I

1'. In a stretcher and clamp for applying lining to brakes, two parallel posts-s aced apart a distance greater than the wi th of a brake shoe, a cross-head having .means thereon for grlpping a lining, said posts being ]01I1ed. at one end by said cross-head, a

' ciamp bar mounted upon said posts and extending across the space therebetween, and means directly engaging both of said posts for adjusting said bar along said posts, the

space between said posts being otherwise unencumbered.

2. In a stretcher and clamp for applying I ling lining to brakes, a brake shoe stra element of generally U-shaped form, lining gripping means upon the transverse portion of said straddling element, a clamp bar' mounted upon the sidebars or posts of said U-shaped element and extending across the space therebetween, and individual means having operative engagement w1th each of said posts for moving said bar along Said straddling element.

3. In a'stretcher and clamp for app ying lining to brakes, two parallel posts space apart a distance greater than thewidth of a brake shoe, a cross-head having means thereon for gripping a lining, said posts being 'oined at one end by said cross-head, a clamp ar bridging the space between said posts,

and nuts threadably enga '2 said posts and means for a and the other adapted to engage sai bar to move it being provideg fit h means for engaging a 7 towards said cross-head. brake shoe, and a nut thread'ably mounted 4. In a stretcher and clamp for appl upon each of said posts and adapted to enlining to brakes, two parallel posts sp ga said movable transverse-bar, whereb v 15 r apart a distance greater than the width of a sai transverse barsmaybemadetoapproac brake shoe, two transverse bars joining said each other. e posts, one of said transverse bars being fixed In testimony whereof,'I hereunto aflix my and one movable along said posts, one of signature. 10 said transverse bars provided with QALOYSIUSJ R'HUMPHREY. 

